Natural Thermoluminescence (NTL) Data for Antarctic Meteorites

Jason Slinker, Paul Benoit, and Derek Sears
Cosmochemistry Group
Dept. of Chemistry and Biochemistry
University of Arkansas
Fayetteville, AR 72701

The measurement and data reduction methods were described by Hasan et al. (1987, Proc. 17th LPSC, E703-E709; 1989, LPSC XX, 383-384). For meteorites whose TL lies between 5 and 100 krad the natural TL is related primarily to terrestrial history. Samples with NTL <5 krad have TL below that which can reasonably be ascribed to long terrestrial ages. Such meteorites have had their TL lowered by heating within the last million years or so (by close solar passage, shock heating, or atmospheric entry), exacerbated, in the case of certain achondrite classes, by "anomalous fading".

SampleClassNTL [krad at 250° C]

EET96029

C2

<1

   

GRA95229

CR2

16 3

   

GRO95551

CHON-AN

18.2 0.3

   

MET96500

HOW

20.7 0.9

   

GRO95509

H5

<3

   

EET96023

H6

23.2 0.1

EET96025

H6

17.0 0.1

EET96027

H6

9.2 0.1

GRO95554

H6

45 3

   

EET96035

L4

<1

   

GRA95216

L5

74.6 0.3

GRA95217

L5

2.0 0.2

GRO95579

L5

79.0 0.5

   

EET96020

L6

8.9 0.1

EET96022

L6

53.4 0.1

EET96024

L6

2.5 0.2

EET96028

L6

50 2

EET96038

L6

85.2 0.5

EET96060

L6

51.3 0.7

EET96061

L6

0.6 0.1

GRO95553

L6

40.6 0.1

GRO95562

L6

24.2 0.2

GRO95563

L6

20.9 0.5

GRO95564

L6

60 1

GRO95567

L6

5.3 0.1

GRO95568

L6

28 1

GRO95604

L6

49.5 0.2

GRO95636

L6

15.9 0.1

GRO95637

L6

39.3 0.1

   

GRO95552

LL4

39.8 0.2

   

GRO95557

LL5

73.2 0.1

   

GRO95556

LL6

47.2 0.5

   

EET96026

R

<2

The quoted uncertainties are the standard deviations shown by replicate measurements of a single aliquot.

COMMENTS: The following comments are based on natural TL data, TL sensitivity, the shape of the induced TL glow curve, classifications, JSC and Arkansas group sample descriptions.

Pairings suggested by the TL data: